P055F: Engine Oil Pressure Out of Range
The measured oil pressure is far outside the expected range for current engine speed and oil temperature - either too low (oil pump weak, oil level low, bearing wear) or anomalously high (relief valve stuck closed, blocked oil cooler).
What P055F means
P055F is a generic OBD-II powertrain code in the speed, idle & cruise group.
- Check engine light
- Usually on
- Emissions-related
- No
- Limp mode possible
- Not typical
- Drive cycle to clear
- Not required
Get it fixed
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Common causes
- 01Oil pump worn or oil level lowMost likely
- 02Pressure relief valve stuckPossible
Can I drive with P055F?
Not until oil pressure is confirmed.
Check the oil level first. If the oil-pressure warning light is on, switch the engine off: running without oil pressure can seize the engine. If the level is fine and the light is off, it may be the sensor, but confirm with a mechanical gauge.
Why we rate it urgent
- Low oil pressure can destroy an engine within minutes
- Turns on the check engine light
Severity is our rule-based rating from the code’s flags in OBDex and the system it affects, not an inspection of your car. If the check engine light is flashing, or you notice overheating, low oil pressure, or brake or steering problems, stop driving and get help.
How to diagnose P055F
- 1
Confirm the code and save freeze-frame data
Read the codes with an OBD-II scan tool and note every code, not just P055F. Save the freeze-frame data (speed, load, temperature when the fault set) before clearing anything; it tells you when the fault happens.
- 2
Fix other faults first
If other codes are stored, start with power-supply, sensor-circuit and communication codes. They can cause this code as a side effect.
- 3
Check live data
Watch the related sensor and actuator readings in live data (Oil pump, Oil pressure sensor A, Oil relief valve) and compare them with expected values in the service information for your vehicle.
- 4
Test the likely causes in order
Start with the most likely cause and work down: Oil pump worn or oil level low; pressure relief valve stuck. Test before replacing parts.
- 5
Check for recalls and service bulletins
Look up recalls for your exact vehicle with its VIN, and ask a dealer about technical service bulletins (TSBs). Manufacturers sometimes issue software updates or extended warranties for known faults.
- 6
Clear the code and verify the repair
After the repair, clear the code and drive the car under the conditions in the freeze-frame data to confirm it does not return.
P055F repair cost estimate
Estimate, not a quote. Labor times are typical ranges for this code from OBDex, and $125/hr is an assumed rate. Shop rates and labor times vary by vehicle and region. Diagnosis time may be billed separately.
- DIY difficulty
- Moderate
- Good DIY job?
- Usually a shop job
Needs a scan tool and some experience with testing.
Parts and systems involved
- Oil pump
- Oil pressure sensor A
- Oil relief valve
P055F FAQ
What does P055F mean?
P055F means “Engine Oil Pressure Out of Range”. The measured oil pressure is far outside the expected range for current engine speed and oil temperature - either too low (oil pump weak, oil level low, bearing wear) or anomalously high (relief valve stuck closed, blocked oil cooler).
Is P055F serious? Can I keep driving?
We rate P055F as urgent severity. Not until oil pressure is confirmed. Check the oil level first. If the oil-pressure warning light is on, switch the engine off: running without oil pressure can seize the engine. If the level is fine and the light is off, it may be the sensor, but confirm with a mechanical gauge.
What causes P055F?
The most common causes, from most to least likely: Oil pump worn or oil level low; Pressure relief valve stuck. Test before replacing parts, because several causes can set the same code.
How much does it cost to fix P055F?
Typical labor is about $125–$1,000 at an assumed $125/hour shop rate, plus parts. That is an estimate, not a quote: labor times and rates vary by vehicle and region, and diagnosis may be billed separately.
Can I fix P055F myself?
DIY difficulty is moderate. Most owners leave this to a shop because it needs involved testing or specialist tools. Always confirm the cause before buying parts.
Will P055F clear itself?
If the fault was intermittent, the warning may go off once the computer stops seeing it, but the code stays in memory. Fix the cause; clearing the code alone doesn’t repair anything.